"Classification Structures for Career Information" was created to provide Career Information Delivery Systems (CIDS) staff with pertinent and useful occupational information arranged according to the Standard Occupational Classification (SOC) structure. Through this publication, the National Occupational Information Coordinating Committee provides technical assistance to states to assist them in converting their existing CIDS to a SOC structure. A secondary purpose of the publication is to provide counselors with a compendium of occupational information compiled from a great variety of sources. The publication is organized in three volumes. This first volume, divided into three parts, contains the 1980 Standard Occupational Classification (SOC) codes and titles in a four-level taxonomy. Subtitled "Occupational Statements," this volume is primarily designed for counselor/client use. It also contains information useful to people using the SOC to classify information obtained from surveys, preparing information for a CIDS, or for other technical purposes. The Occupational Statements contain a brief guidance-oriented definition for each of the 834 categories contained in the 1980 SOC. Each definition is identified with both the SOC title and its code. In those cases where a SOC category has been assigned Dictionary of Occupational Titles (DOT) codes and titles, this additional information is included: sample work activities, hours of work, travel, and sample places of work. [This document contains part 2 of volume I--SOC numbers 4499 (administrative support occupations) to 6560 (mining occupations).] (KC)